Downhole turbine

Details Downhole turbine Downhole turbine

2008-10-31

2010-06-08

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

Processes

Boring curved or redirected bores

C175S073000, C175S107000, C175S385000, C175S399000

Reexamination Certificate

active

07730972

ABSTRACT:
In one aspect of the present invention, a drill bit has a jack element that is substantially coaxial with an axis of rotation of the drill bit and the jack element has an asymmetrical distal end that extends beyond a working face of the drill bit. A turbine is located within a bore formed in the drill bit and a flow valve is actuated by the turbine. The flow valve is adapted to route a drilling fluid in the bore into a porting mechanism adapted to extend the jack element farther beyond the working surface of the drill bit. The turbine is also adapted to rotate the jack element at variable speeds.

REFERENCES:
patent: 4637479 (1987-01-01), Leising
patent: 5314030 (1994-05-01), Peterson et al.
patent: 5553678 (1996-09-01), Barr et al.
patent: 6089332 (2000-07-01), Barr et al.
patent: 2004/0238221 (2004-12-01), Runia et al.

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